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A000694
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Related to population of numbers of form x^2 + y^2.
(Formerly M1021 N0384)
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0
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1, 2, 4, 6, 11, 19, 34, 63, 117, 218, 411, 780, 1487, 2849, 5477, 10562, 20419, 39563, 76805, 149360, 290896, 567321, 1107775, 2165487, 4237384, 8299283, 16268639, 31915437, 62656158, 123088460, 241958676, 475901501, 936544684
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OFFSET
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1,2
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COMMENTS
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Shanks' paper gives erroneous value a(16)=10555. - Sean A. Irvine, Feb 25 2011
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REFERENCES
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N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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MAPLE
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Digits:=500;
K:=.764223653589220662990698731250092328116790541393409514721686673
7496146416587328588384015050131312337219372691207925926341874206467
8084323063315434629380531605171169636177508819961243824994277683469
0516235139218719620569053295644670419176349770659569905712938660289
3858998296105166296089099177929836072973697200640316985128636517347
3921065768550978681981674707359066921;
a:=n->round(evalf((2/3)*K*int(1/sqrt(ln(t)), t=1..2^n)));
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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